Is it normal for the car's water temperature gauge to show a green light?

1 Answers
RafaelLee
07/30/25 6:46am
It is normal for the car's water temperature gauge to show a green light. The green light indicates that the temperature has not yet reached the normal operating range and will disappear once the water temperature rises. Here is some additional information: Mercury thermometer: A mercury thermometer is a type of expansion thermometer. The freezing point of mercury is -39 degrees Celsius, and its boiling point is 356.7 degrees Celsius. It is used to measure temperatures within the range of -39 to 357 degrees Celsius and serves only as an on-site monitoring device. Using it to measure temperature is not only simple and intuitive but also helps avoid errors associated with remote temperature sensors. Self-check function: This is part of the car's self-check function and is a normal phenomenon. When the car starts, indicator lights for many sensors will illuminate, which can be seen on the dashboard. These lights will turn off after a few seconds as part of the self-check process. After prolonged parking, a blue light appearing upon startup indicates low water temperature because the normal operating temperature of the radiator is between 60-80 degrees Celsius. If the ambient temperature has not yet reached the working temperature, the water temperature light will remain on. In this case, it is normal after preheating for 2-3 minutes.
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